Solved
@pausob wrote:
This sounds like the problem described in this thread:
'Placement' sub menu won't appear - what have I missed?
along with the solution to "reset" the GUI panel placements.
To clarify this answer, the solution in that thread is a link to another thread and the solution there isn't really what you want. It's at the bottom of the second thread, here:
To save you the clicking, it says:
@Mahesh_Sharma wrote:
In such cases other option can be used to rest the position of panels. Option "Rest Panels Position" is available under File > Options > Window Settings "Rest Panels Position".
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.

